Curtain Fabric Calculator
Calculate precisely how much fabric you need for your curtains. Enter your window measurements, select your preferred heading type, and get accurate fabric quantities including allowances for hems, headings, and pattern repeats.
Total Fabric Required
This includes all necessary allowances for hems, headings, and pattern matching
Measuring Your Windows
- Measure the width of your window recess or pole
- Add 10-30cm on each side for better light blocking
- Measure from the top of your pole to your desired length
- Consider if curtains will hang inside or outside the recess
- Account for radiators or window sills below
- Use a steel tape measure for accuracy
Heading Types Explained
- Pencil Pleat: Classic gathered style, requires 2-2.5x width
- Pinch Pleat: Formal pleats, typically needs 2x width
- Tab Top: Casual style with fabric loops, 1.5x width
- Eyelet: Metal rings through fabric, requires 2x width
- Gathered: Simple gathering, needs 1.5-2x width
- Wave: Modern ripple effect, requires 2.5x width
Fabric Selection Tips
- Choose fabric weight appropriate for your window size
- Consider light filtering vs blackout requirements
- Check fabric care instructions before purchasing
- Natural fibres may shrink – factor this into calculations
- Lined curtains hang better and last longer
- Consider the room’s colour scheme and style
Professional Installation
- Install curtain poles 10-20cm above the window
- Extend poles 15-30cm beyond each side of the window
- Check wall type before choosing fixing method
- Consider ceiling mounting for tall windows
- Test pole strength before hanging heavy curtains
- Allow curtains to hang for 24 hours before final hemming
Frequently Asked Questions
How much extra fabric should I buy?
Always purchase an additional 10-20cm beyond the calculated amount. This accounts for cutting errors, pattern matching adjustments, and potential future alterations. If your fabric has a large pattern repeat, consider buying an extra pattern repeat length.
What if my fabric width is different from the options?
The calculator uses standard UK fabric widths. If your fabric is narrower, you may need additional widths. If it’s wider (like 280cm), you might need less. Contact your fabric supplier to confirm the exact width available.
Can I use this calculator for bay windows?
For bay windows, measure each section separately and calculate fabric for each. The total will be the sum of all sections. Consider how the curtains will hang – whether on a curved track or individual poles for each section.
How do I calculate for patterned fabrics?
Enter the pattern repeat distance in centimetres. The calculator will automatically adjust the fabric length to ensure patterns align across all curtain widths. Larger patterns require more fabric due to matching requirements.
What about lining fabric?
Lining fabric typically requires the same amount as your main fabric, minus pattern repeat allowances. Standard lining is usually 137cm wide. Cotton sateen or blackout lining are popular choices in the UK.
Should curtains touch the floor?
This depends on your preference and room style. Curtains can finish at the sill, just below the sill, or floor length. Floor-length curtains should either just touch the floor or have a slight break. Avoid curtains that hover above the floor.